A situation arose where I needed to use the "Shadowcloak of Nocturnal", I cast it, and it didn't take affect. So I stood still, stood up, then crouched again and it worked, but anytime I interact with something (a door, pickup an item, etc....) the cloak disables itself and I have to stand up and crouch again. It's kind of annoying and counter productive. Is this normal? Does it just keep you invisible without interaction? Is it supposed to stop randomly?

Thanks.

It's only for 120 seconds and works while sneaking. So I'm pretty sure if you activate something or attack anything it will disable

It works the same as any normal invisibility spell. Once you activate something, you will no longer be invisible. However, the power does last for the entire 120 seconds, and you can re-enter the state of invisibility as many times as you want within that 120 seconds by crouching.

Hope that clears things up for you.